Terminal Fitting Curved R Surface Seal Extraction
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Solution Overview
Problem
Existing terminal fittings are difficult to remove from connectors due to interference with seals, leading to reduced operational efficiency and potential seal damage.
Innovation Solution
A terminal fitting with a tubular main portion featuring a resiliently deformable contact piece and a fixed contact portion, including a curved R surface that allows smooth extraction without damaging the seal, and a contact main portion that is folded and fixed to maintain stable contact pressure with the male tab.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the terminal fitting is pulled out from the connector, then the terminal fitting can be removed for replacement or maintenance, but the rear edge of the main portion may be caught by the seal causing difficulty in removal and potential seal damage
Solution Approach 1:
The harmful function of the rear edge catching the seal is extracted and neutralized by forming a curved R surface that guides the edge away from the seal, allowing removal without seal contact
Solution Approach 2:
The curved R surface acts as an intermediary element between the rear edge and the seal, providing a smooth transition path that prevents direct contact and potential damage during removal
2Reliability
If the contact portion is formed by folding the outer wall, then the contact pressure can be adjusted and stable electrical connection achieved, but the structural complexity increases
Solution Approach 1:
The contact portion is merged with the outer wall of the main portion through folding, combining structural support and electrical contact functions into a single integrated element, reducing overall complexity while maintaining reliability
Solution Approach 2:
The folded contact portion creates a resilient structure that can dynamically adjust contact pressure through elastic deformation, ensuring stable electrical connection while accommodating manufacturing tolerances and wear
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient removal of the terminal fitting without damaging the seal and maintains stable contact pressure, improving operational efficiency and reducing interference issues.
Implementation Method 1
a resiliently deformable contact piece is formed in the main portion
Implementation Method 2
The R surface slides on the inner peripheral surface of the wire insertion hole of the seal when the terminal fitting is pulled out backward
Data Source
AI summary
A terminal fitting (10) includes a tubular main portion (11) into which a mating male tab (91) is insertable from the front. A resilient contact piece (22) which is to be resiliently held in contact with the male tab (91) is resiliently deformably formed in the main portion (11), and a contact portion (32) which receives the male tab (91) is fixedly formed at a position facing the resilient contact piece (22). The contact portion (32) includes a folded part formed by folding a backward extending part of an outer wall of the main portion (11) inwardly and forwardly. A curved R surface (41) is formed on the outer surface of the folded part of the contact portion (32).